Research On Module Structures Of Bromus Inermis Population In Artificial Grassland

Bromus inermis Leyss is a perennial plant of the herbaceous plant. The grass has well-developed underground rhizomes. On two artificial spots (in 2004 and 2005 built, respectively), the quantitative structures, biomass structures and productivity of tillers were analyzed at three growing stages, and the biomass allocation of reproductive tillers at seed ripen stage were measured. They are important to the structure and biomass allocation theory of clonal plant.To B. inermis population sowed in 2005 and 2004, the number of vegetative tillers was dominant at initial stages of tassel; the number of reproductive tillers was dominant at flowering and unfledged stages. At initial tassel, flowering, unfledged stages, vegetative, reproductive and total tillers consisted of 3-5 age classes, the 2 age was dominant. These indicated the age structures of vegetative tillers, reproductive tillers and total tillers were stable. The variation was high in elder tiller number. Buds composed of 5 and 6 age classes, the 2 age class was dominant, and this also showed stable structure.To B. inermis population sowed in 2005 and 2004, the biomass of reproductive tillers was dominant at all the three growing stages. The biomass of vegetative, reproductive and total tillers consisted of 3-5 age classes. And the 2 age class was dominant; also the age structure was stable.To B. inermis population sowed in 2005, the productivity of the 2 age class vegetative tillers was the highest at initial stages of tassel. And that of 3 age class was the highest at flowering and unfledged stages. The productivity of the 1 age class reproductive tillers was the highest at these three growing stages. The mean productivity of total 1 age class tillers was the highest and decreased with the increase of age classes. To B. inermis population sowed in 2004, the productivity of the 1 age class vegetative tillers was dominant at initial tassel and flowering stages. To the reproductive tillers, the productivity of the 4 age class was the highest, and then was the 3 and 1 age class with growing stages.To B. inermis populations sowed in 2005 and 2004, the allocation of aboveground biomass to stem (54.91% and 53.14%) was higher than inflorescence and leaf at seed ripen stage. To B. inermis population sowed in 2004, the biomass of stem was the most of them, which of leaf and inflorescence decreased in turn.To B. inermis populations sowed in 2005 and 2004, the relationship of tiller height and inflorescence length was significant linear, and that of tiller height and total biomass was significant power at the seed ripen stage. To the sowing in 2004, the relationships between tiller height and leaf biomass and between length and biomass of inflorescence were linear at significant level.